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« Requesting backup: NFPA Journal underscores the importance of emergency power systems | Main | News reports: Nightclub fire in Brazil kills hundreds »

01/25/2013

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Derek Duval

Venkateswara Bhamidipati,

Thank you for your comment. You can review the preliminary draft and follow along with the development of this new standard here www.nfpa.org/652. You second question seems to be more geared toward the ASTM testing and not the NFPA standard. You can also submit any comments you have to the development of this document starting in September.

Venkateswara Sarma Bhamidipati

1 We should clearly work out a way to classify combustible dusts and non combustible dust with addtional information. Not just Kst/Pmax alone. For eg. Milk Powder and Sulfur have same range of Kst/PMax. Is it justified? May be new class which takes into account of MIE also?

2. What is the reason for using Chemical Igniters as against Electric arc in ASTM-1226.

Can this test be used in using A/B explosion classification (like in ATEX draft std)? does that use electric spark?

We have seen that commercial Kst test labs use 2 x 5 KJ chemical in 20 Lt vessel. Is it not overdriving the results?

Why they do not use electrical arc and if this helps in ruling out some dusts as non-combustible and exclude as B class

We should also highlight and distinguish the differences between electric arc/chemical igniters in triggering explosion

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